The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 2005
Filed:
Apr. 17, 2001
Francois Hyvrard, Triel-sur-Seine, FR;
Pascal Muller, Mantes la Ville, FR;
Francois Hyvrard, Triel-sur-Seine, FR;
Pascal Muller, Mantes la Ville, FR;
Sarp Industries, Limay, FR;
Abstract
A method for treating and upgrading effluents containing at least a metallic sulphate comprising adding at least a base to the effluent to precipitate the metallic ions in the form of iron oxy-hydroxides Fe(OH) wherein x=2 and/or 3; separating the precipitated hydroxide calcium sulphate CaSO; and separating the calcium sulphate CaSOprecipitated during the preceding step. Said method enables obtainment of calcium sulphate (white gypsum) substantially free of metals and therefore capable of being upgraded and iron oxy-hydroxides likewise capable of being upgraded.